feat(simulation): add simulator basics

[MadeInPierre]

Description

This PR adds a Simulator to apply a series of events until a final date is reached.

Implementation

This first version supports:

• Monthly salaries/bonuses
• Apply the expected performance of each investment at the end of each year
• Auto-balance the portfolio by following the ideal amounts based on your targets

Steps

• Create Timeline and manage a stack of Events
• Simulate the portfolio's future and display its total worth
  • Display the total worth every 5 years in the performance panel
• Step features
  • Autoapply recommendations (autobalance)
  • Apply yearly Performance & Inflation
• Prepare for additional events :
  • Create loan, buy a house, sell stocks...
  • Apply taxes when transferring between envelopes
• Docstrings
• Documentation